2011 has proven to be a successful year for email marketers across all industries and types of businesses. More companies are allocating larger portions of their budget to email marketing, finding ways to provide the most relevant content possible, and expanding their strategies into new platforms such as social media and mobile email marketing.

Email is bringing in $40.56 for every dollar spent on it in 2011, compared to catalogsâ€™ ROI of $7.30, searchâ€™s return of $22.24, Internet display advertisingâ€™s return of $19.72 and mobileâ€™s return of $10.51.
Source: Direct Marketing Association â€œPower of Directâ€

With regards to the biggest factors in improving email deliverability, 64% said clean up-to-date lists were most important, followed by relevance at 52% and sender reputation at 42%.
Source: Econsultancy â€œEmail Marketing Census 2011***8243;

When subscribers are no longer interested in a companyâ€™s permission-based emails, the typical action of 67% of subscribers is to click the unsubscribe link.
Source: ExactTarget â€œThe Social Break-Upâ€

Email is the preferred method of commercial communication by 74% of all online adults.
Source: Merkle â€œView From the Digital Inbox 2011***8243;

36% of consumers say that email marketing has become more relevant in the last 12 months.
Source: e-Dialog, â€œ2011 EMAIL ATTITUDES REPORT: Email Relevance and the Proliferation of Mobile Email Useâ€

54% of people who unsubscribe from permission-based emails said the reason was emails coming too frequently. This was second to people who unsubscribe because they found the content repetitive or boring (49%).
Source: ExactTarget â€œThe Social Break-Upâ€

Sundays generated the highest volume of opens (12.2%) and clicks (4.4%) on average when compared to the rest of the week. And email marketers who scheduled their email campaigns to be delivered between 1 am and 5 am experienced higher volumes of email opens and clicks.
Source: MailerMailer â€œEmail Marketing Metrics Reportâ€

13.36% of emails are opened by a mobile device. This is broken down by the following: iPhone 8.74%, iPad 2%, Android 1.9% and Blackberry 0.15%.
Source: Knotice

42% of social media users check personal email accounts 4 or more times per day, compared to 26% of non social users. (Social media users were identified by the use of one or more of the sites Facebook, MySpace or Twitter)
Source: Merkle â€œView From the Digital Inbox 2011***8243;